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Simplifying 90 = (1 + 3x) + (x + 13) Remove parenthesis around (1 + 3x) 90 = 1 + 3x + (x + 13) Reorder the terms: 90 = 1 + 3x + (13 + x) Remove parenthesis around (13 + x) 90 = 1 + 3x + 13 + x Reorder the terms: 90 = 1 + 13 + 3x + x Combine like terms: 1 + 13 = 14 90 = 14 + 3x + x Combine like terms: 3x + x = 4x 90 = 14 + 4x Solving 90 = 14 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 90 + -4x = 14 + 4x + -4x Combine like terms: 4x + -4x = 0 90 + -4x = 14 + 0 90 + -4x = 14 Add '-90' to each side of the equation. 90 + -90 + -4x = 14 + -90 Combine like terms: 90 + -90 = 0 0 + -4x = 14 + -90 -4x = 14 + -90 Combine like terms: 14 + -90 = -76 -4x = -76 Divide each side by '-4'. x = 19 Simplifying x = 19
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